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I'm submitting this thread to post picture of project in which I try to build my first Tractrix (Bruce Edgar) horn. the fist try is a fc260 horn with ~58cm wide 25cm height and ~37cm depth. the throat is 2" and I intent to use it with BMS 4592ND as a midrange horn.

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we have almost any tools except band saw so I used CNC router we built. very very precise machine with HDS spindle specially designed to cut BB plywood. we were not able to set the Artcam as the z axis gradually varies according to X and Y axis movement so we cut the center template of the horn in four steps in Z axis.

the first step was to build a fixture to keep the MDF or BB plywood in the needed incline. CNC did the job. after gluing parts we sanded it:

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I didn't take 5mm of horn edge into consideration and thus the assembly fixture center template was 5mm short in height so the horn throat now is 47mm to 50mm. I'm going to build a new fixture and build the horn again. it's a 1-2 hours job.